1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
|
;;; register.el --- register commands for Emacs -*- lexical-binding: t; -*-
;; Copyright (C) 1985, 1993-1994, 2001-2015 Free Software Foundation,
;; Inc.
;; Maintainer: emacs-devel@gnu.org
;; Keywords: internal
;; Package: emacs
;; This file is part of GNU Emacs.
;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; This package of functions emulates and somewhat extends the venerable
;; TECO's `register' feature, which permits you to save various useful
;; pieces of buffer state to named variables. The entry points are
;; documented in the Emacs user's manual: (info "(emacs) Registers").
(eval-when-compile (require 'cl-lib))
;;; Code:
;; FIXME: Clean up namespace usage!
(cl-defstruct
(registerv (:constructor nil)
(:constructor registerv--make (&optional data print-func
jump-func insert-func))
(:copier nil)
(:type vector)
:named)
(data nil :read-only t)
(print-func nil :read-only t)
(jump-func nil :read-only t)
(insert-func nil :read-only t))
(cl-defun registerv-make (data &key print-func jump-func insert-func)
"Create a register value object.
DATA can be any value.
PRINT-FUNC if provided controls how `list-registers' and
`view-register' print the register. It should be a function
receiving one argument DATA and print text that completes
this sentence:
Register X contains [TEXT PRINTED BY PRINT-FUNC]
JUMP-FUNC if provided, controls how `jump-to-register' jumps to the register.
INSERT-FUNC if provided, controls how `insert-register' insert the register.
They both receive DATA as argument."
(registerv--make data print-func jump-func insert-func))
(defvar register-alist nil
"Alist of elements (NAME . CONTENTS), one for each Emacs register.
NAME is a character (a number). CONTENTS is a string, number, marker, list
or a struct returned by `registerv-make'.
A list of strings represents a rectangle.
A list of the form (file . FILE-NAME) represents the file named FILE-NAME.
A list of the form (file-query FILE-NAME POSITION) represents
position POSITION in the file named FILE-NAME, but query before
visiting it.
A list of the form (WINDOW-CONFIGURATION POSITION)
represents a saved window configuration plus a saved value of point.
A list of the form (FRAME-CONFIGURATION POSITION)
represents a saved frame configuration plus a saved value of point.")
(defgroup register nil
"Register commands."
:group 'convenience
:version "24.3")
(defcustom register-separator nil
"Register containing the text to put between collected texts, or nil if none.
When collecting text with \\[append-to-register] (or \\[prepend-to-register]),
contents of this register is added to the beginning (or end, respectively)
of the marked text."
:group 'register
:type '(choice (const :tag "None" nil)
(character :tag "Use register" :value ?+)))
(defcustom register-preview-delay 1
"If non-nil, time to wait in seconds before popping up a preview window.
If nil, do not show register previews, unless `help-char' (or a member of
`help-event-list') is pressed."
:version "24.4"
:type '(choice number (const :tag "No preview unless requested" nil))
:group 'register)
(defun get-register (register)
"Return contents of Emacs register named REGISTER, or nil if none."
(alist-get register register-alist))
(defun set-register (register value)
"Set contents of Emacs register named REGISTER to VALUE. Returns VALUE.
See the documentation of the variable `register-alist' for possible VALUEs."
(setf (alist-get register register-alist) value))
(defun register-describe-oneline (c)
"One-line description of register C."
(let ((d (replace-regexp-in-string
"\n[ \t]*" " "
(with-output-to-string (describe-register-1 c)))))
(if (string-match "Register.+? contains \\(?:an? \\|the \\)?" d)
(substring d (match-end 0))
d)))
(defun register-preview-default (r)
"Default function for the variable `register-preview-function'."
(format "%s: %s\n"
(single-key-description (car r))
(register-describe-oneline (car r))))
(defvar register-preview-function #'register-preview-default
"Function to format a register for previewing.
Takes one argument, a cons (NAME . CONTENTS) as found in `register-alist'.
Returns a string.")
(defun register-preview (buffer &optional show-empty)
"Pop up a window to show register preview in BUFFER.
If SHOW-EMPTY is non-nil show the window even if no registers.
Format of each entry is controlled by the variable `register-preview-function'."
(when (or show-empty (consp register-alist))
(with-current-buffer-window
buffer
(cons 'display-buffer-below-selected
'((window-height . fit-window-to-buffer)
(preserve-size . (nil . t))))
nil
(with-current-buffer standard-output
(setq cursor-in-non-selected-windows nil)
(insert (mapconcat register-preview-function register-alist ""))))))
(defun register-read-with-preview (prompt)
"Read and return a register name, possibly showing existing registers.
Prompt with the string PROMPT. If `register-alist' and
`register-preview-delay' are both non-nil, display a window
listing existing registers after `register-preview-delay' seconds.
If `help-char' (or a member of `help-event-list') is pressed,
display such a window regardless."
(let* ((buffer "*Register Preview*")
(timer (when (numberp register-preview-delay)
(run-with-timer register-preview-delay nil
(lambda ()
(unless (get-buffer-window buffer)
(register-preview buffer))))))
(help-chars (cl-loop for c in (cons help-char help-event-list)
when (not (get-register c))
collect c)))
(unwind-protect
(progn
(while (memq (read-key (propertize prompt 'face 'minibuffer-prompt))
help-chars)
(unless (get-buffer-window buffer)
(register-preview buffer 'show-empty)))
(if (characterp last-input-event) last-input-event
(error "Non-character input-event")))
(and (timerp timer) (cancel-timer timer))
(let ((w (get-buffer-window buffer)))
(and (window-live-p w) (delete-window w)))
(and (get-buffer buffer) (kill-buffer buffer)))))
(defun point-to-register (register &optional arg)
"Store current location of point in register REGISTER.
With prefix argument, store current frame configuration.
Use \\[jump-to-register] to go to that location or restore that configuration.
Argument is a character, naming the register.
Interactively, reads the register using `register-read-with-preview'."
(interactive (list (register-read-with-preview "Point to register: ")
current-prefix-arg))
;; Turn the marker into a file-ref if the buffer is killed.
(add-hook 'kill-buffer-hook 'register-swap-out nil t)
(set-register register
(if arg (list (current-frame-configuration) (point-marker))
(point-marker))))
(defun window-configuration-to-register (register &optional _arg)
"Store the window configuration of the selected frame in register REGISTER.
Use \\[jump-to-register] to restore the configuration.
Argument is a character, naming the register.
Interactively, reads the register using `register-read-with-preview'."
(interactive (list (register-read-with-preview
"Window configuration to register: ")
current-prefix-arg))
;; current-window-configuration does not include the value
;; of point in the current buffer, so record that separately.
(set-register register (list (current-window-configuration) (point-marker))))
;; It has had the optional arg for ages, but never used it.
(set-advertised-calling-convention 'window-configuration-to-register
'(register) "24.4")
(defun frame-configuration-to-register (register &optional _arg)
"Store the window configuration of all frames in register REGISTER.
Use \\[jump-to-register] to restore the configuration.
Argument is a character, naming the register.
Interactively, reads the register using `register-read-with-preview'."
(interactive (list (register-read-with-preview
"Frame configuration to register: ")
current-prefix-arg))
;; current-frame-configuration does not include the value
;; of point in the current buffer, so record that separately.
(set-register register (list (current-frame-configuration) (point-marker))))
;; It has had the optional arg for ages, but never used it.
(set-advertised-calling-convention 'frame-configuration-to-register
'(register) "24.4")
(make-obsolete 'frame-configuration-to-register 'frameset-to-register' "24.4")
(defalias 'register-to-point 'jump-to-register)
(defun jump-to-register (register &optional delete)
"Move point to location stored in a register.
If the register contains a file name, find that file.
\(To put a file name in a register, you must use `set-register'.)
If the register contains a window configuration (one frame) or a frameset
\(all frames), restore that frame or all frames accordingly.
First argument is a character, naming the register.
Optional second arg non-nil (interactively, prefix argument) says to
delete any existing frames that the frameset doesn't mention.
\(Otherwise, these frames are iconified.)
Interactively, reads the register using `register-read-with-preview'."
(interactive (list (register-read-with-preview "Jump to register: ")
current-prefix-arg))
(let ((val (get-register register)))
(cond
((registerv-p val)
(cl-assert (registerv-jump-func val) nil
"Don't know how to jump to register %s"
(single-key-description register))
(funcall (registerv-jump-func val) (registerv-data val)))
((and (consp val) (frame-configuration-p (car val)))
(set-frame-configuration (car val) (not delete))
(goto-char (cadr val)))
((and (consp val) (window-configuration-p (car val)))
(set-window-configuration (car val))
(goto-char (cadr val)))
((markerp val)
(or (marker-buffer val)
(error "That register's buffer no longer exists"))
(switch-to-buffer (marker-buffer val))
(goto-char val))
((and (consp val) (eq (car val) 'file))
(find-file (cdr val)))
((and (consp val) (eq (car val) 'file-query))
(or (find-buffer-visiting (nth 1 val))
(y-or-n-p (format "Visit file %s again? " (nth 1 val)))
(error "Register access aborted"))
(find-file (nth 1 val))
(goto-char (nth 2 val)))
(t
(error "Register doesn't contain a buffer position or configuration")))))
(defun register-swap-out ()
"Turn markers into file-query references when a buffer is killed."
(and buffer-file-name
(dolist (elem register-alist)
(and (markerp (cdr elem))
(eq (marker-buffer (cdr elem)) (current-buffer))
(setcdr elem
(list 'file-query
buffer-file-name
(marker-position (cdr elem))))))))
(defun number-to-register (number register)
"Store a number in a register.
Two args, NUMBER and REGISTER (a character, naming the register).
If NUMBER is nil, a decimal number is read from the buffer starting
at point, and point moves to the end of that number.
Interactively, NUMBER is the prefix arg (none means nil).
Interactively, reads the register using `register-read-with-preview'."
(interactive (list current-prefix-arg
(register-read-with-preview "Number to register: ")))
(set-register register
(if number
(prefix-numeric-value number)
(if (looking-at "\\s-*-?[0-9]+")
(progn
(goto-char (match-end 0))
(string-to-number (match-string 0)))
0))))
(defun increment-register (prefix register)
"Augment contents of REGISTER.
Interactively, PREFIX is in raw form.
If REGISTER contains a number, add `prefix-numeric-value' of
PREFIX to it.
If REGISTER is empty or if it contains text, call
`append-to-register' with `delete-flag' set to PREFIX.
Interactively, reads the register using `register-read-with-preview'."
(interactive (list current-prefix-arg
(register-read-with-preview "Increment register: ")))
(let ((register-val (get-register register)))
(cond
((numberp register-val)
(let ((number (prefix-numeric-value prefix)))
(set-register register (+ number register-val))))
((or (not register-val) (stringp register-val))
(append-to-register register (region-beginning) (region-end) prefix))
(t (error "Register does not contain a number or text")))))
(defun view-register (register)
"Display what is contained in register named REGISTER.
The Lisp value REGISTER is a character.
Interactively, reads the register using `register-read-with-preview'."
(interactive (list (register-read-with-preview "View register: ")))
(let ((val (get-register register)))
(if (null val)
(message "Register %s is empty" (single-key-description register))
(with-output-to-temp-buffer "*Output*"
(describe-register-1 register t)))))
(defun list-registers ()
"Display a list of nonempty registers saying briefly what they contain."
(interactive)
(let ((list (copy-sequence register-alist)))
(setq list (sort list (lambda (a b) (< (car a) (car b)))))
(with-output-to-temp-buffer "*Output*"
(dolist (elt list)
(when (get-register (car elt))
(describe-register-1 (car elt))
(terpri))))))
(defun describe-register-1 (register &optional verbose)
(princ "Register ")
(princ (single-key-description register))
(princ " contains ")
(let ((val (get-register register)))
(cond
((registerv-p val)
(if (registerv-print-func val)
(funcall (registerv-print-func val) (registerv-data val))
(princ "[UNPRINTABLE CONTENTS].")))
((numberp val)
(princ val))
((markerp val)
(let ((buf (marker-buffer val)))
(if (null buf)
(princ "a marker in no buffer")
(princ "a buffer position:\n buffer ")
(princ (buffer-name buf))
(princ ", position ")
(princ (marker-position val)))))
((and (consp val) (window-configuration-p (car val)))
(princ "a window configuration."))
((and (consp val) (frame-configuration-p (car val)))
(princ "a frame configuration."))
((and (consp val) (eq (car val) 'file))
(princ "the file ")
(prin1 (cdr val))
(princ "."))
((and (consp val) (eq (car val) 'file-query))
(princ "a file-query reference:\n file ")
(prin1 (car (cdr val)))
(princ ",\n position ")
(princ (car (cdr (cdr val))))
(princ "."))
((consp val)
(if verbose
(progn
(princ "the rectangle:\n")
(while val
(princ " ")
(princ (car val))
(terpri)
(setq val (cdr val))))
(princ "a rectangle starting with ")
(princ (car val))))
((stringp val)
(setq val (copy-sequence val))
(if (eq yank-excluded-properties t)
(set-text-properties 0 (length val) nil val)
(remove-list-of-text-properties 0 (length val)
yank-excluded-properties val))
(if verbose
(progn
(princ "the text:\n")
(princ val))
(cond
;; Extract first N characters starting with first non-whitespace.
((string-match (format "[^ \t\n].\\{,%d\\}"
;; Deduct 6 for the spaces inserted below.
(min 20 (max 0 (- (window-width) 6))))
val)
(princ "text starting with\n ")
(princ (match-string 0 val)))
((string-match "^[ \t\n]+$" val)
(princ "whitespace"))
(t
(princ "the empty string")))))
(t
(princ "Garbage:\n")
(if verbose (prin1 val))))))
(defun insert-register (register &optional arg)
"Insert contents of register REGISTER. (REGISTER is a character.)
Normally puts point before and mark after the inserted text.
If optional second arg is non-nil, puts mark before and point after.
Interactively, second arg is nil if prefix arg is supplied and t
otherwise.
Interactively, reads the register using `register-read-with-preview'."
(interactive (progn
(barf-if-buffer-read-only)
(list (register-read-with-preview "Insert register: ")
(not current-prefix-arg))))
(push-mark)
(let ((val (get-register register)))
(cond
((registerv-p val)
(cl-assert (registerv-insert-func val) nil
"Don't know how to insert register %s"
(single-key-description register))
(funcall (registerv-insert-func val) (registerv-data val)))
((consp val)
(insert-rectangle val))
((stringp val)
(insert-for-yank val))
((numberp val)
(princ val (current-buffer)))
((and (markerp val) (marker-position val))
(princ (marker-position val) (current-buffer)))
(t
(error "Register does not contain text"))))
(if (not arg) (exchange-point-and-mark)))
(defun copy-to-register (register start end &optional delete-flag region)
"Copy region into register REGISTER.
With prefix arg, delete as well.
Called from program, takes five args: REGISTER, START, END, DELETE-FLAG,
and REGION. START and END are buffer positions indicating what to copy.
The optional argument REGION if non-nil, indicates that we're not just
copying some text between START and END, but we're copying the region.
Interactively, reads the register using `register-read-with-preview'."
(interactive (list (register-read-with-preview "Copy to register: ")
(region-beginning)
(region-end)
current-prefix-arg
t))
(set-register register (if region
(funcall region-extract-function delete-flag)
(prog1 (filter-buffer-substring start end)
(if delete-flag (delete-region start end)))))
(setq deactivate-mark t)
(cond (delete-flag)
((called-interactively-p 'interactive)
(indicate-copied-region))))
(defun append-to-register (register start end &optional delete-flag)
"Append region to text in register REGISTER.
With prefix arg, delete as well.
Called from program, takes four args: REGISTER, START, END and DELETE-FLAG.
START and END are buffer positions indicating what to append.
Interactively, reads the register using `register-read-with-preview'."
(interactive (list (register-read-with-preview "Append to register: ")
(region-beginning)
(region-end)
current-prefix-arg))
(let ((reg (get-register register))
(text (filter-buffer-substring start end))
(separator (and register-separator (get-register register-separator))))
(set-register
register (cond ((not reg) text)
((stringp reg) (concat reg separator text))
(t (error "Register does not contain text")))))
(setq deactivate-mark t)
(cond (delete-flag
(delete-region start end))
((called-interactively-p 'interactive)
(indicate-copied-region))))
(defun prepend-to-register (register start end &optional delete-flag)
"Prepend region to text in register REGISTER.
With prefix arg, delete as well.
Called from program, takes four args: REGISTER, START, END and DELETE-FLAG.
START and END are buffer positions indicating what to prepend.
Interactively, reads the register using `register-read-with-preview'."
(interactive (list (register-read-with-preview "Prepend to register: ")
(region-beginning)
(region-end)
current-prefix-arg))
(let ((reg (get-register register))
(text (filter-buffer-substring start end))
(separator (and register-separator (get-register register-separator))))
(set-register
register (cond ((not reg) text)
((stringp reg) (concat text separator reg))
(t (error "Register does not contain text")))))
(setq deactivate-mark t)
(cond (delete-flag
(delete-region start end))
((called-interactively-p 'interactive)
(indicate-copied-region))))
(defun copy-rectangle-to-register (register start end &optional delete-flag)
"Copy rectangular region into register REGISTER.
With prefix arg, delete as well.
To insert this register in the buffer, use \\[insert-register].
Called from a program, takes four args: REGISTER, START, END and DELETE-FLAG.
START and END are buffer positions giving two corners of rectangle.
Interactively, reads the register using `register-read-with-preview'."
(interactive (list (register-read-with-preview
"Copy rectangle to register: ")
(region-beginning)
(region-end)
current-prefix-arg))
(let ((rectangle (if delete-flag
(delete-extract-rectangle start end)
(extract-rectangle start end))))
(set-register register rectangle)
(when (and (null delete-flag)
(called-interactively-p 'interactive))
(setq deactivate-mark t)
(indicate-copied-region (length (car rectangle))))))
(provide 'register)
;;; register.el ends here
|